Windaq Add-ons

UltimaWaterfall

XChart

FFT1024

Lessons

Fast Fourier Transform (FFT) (ID=7001)

This Windaq add-on provides real-time 1024-point FFT power spectrum for DATAQ's WinDaq  acquisition software. Due to the present of a newer and similar add-on called FFT II, this one is normally installed as hidden. Please use Windaq Add-on Manager to add it to Windaq's menu if you wish to use this add-on.

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Hightlights

• For better performance, please switch to the second generation of Windaq Add-on, FFT II
• Analog oscilloscope-like persistence control helps to study the trend of the spectrum (Refer to the above screen shot for visual effect)
• While acquiring spectrum, you may use the mouse  to drag the waveform up and down, or double-click the buttons to change the scaling of the waveform. 
• Once you stop the live frequency display, you may click on the chart to enable a cursor and drag it around to study the spectrum
• Multiple FFT windows for different channels under Windaq
• Channel number is a 0-based index to Windaq's scanlist. For example, if Windaq has channel 3,4,6,7 enabled, one can enter 0 for channel 3, 1 for channel 4, 2 for channel 6 and 3 for channel 7.
• Intelligent Channel Select: Highlight/Select a channel in Windaq and fire up this Windaq add-on, and it will use the selected channel as its default channel
• Due to Windaq's memory allocation approach, up 29 channels can be enabled in Windaq if you wish to use this add-on
• FFT1024's resolution is about 10-bit, thus weak frequency components will be buried in the noise. To address this problem, Dynamic Amplifier option is created. When checked, waveform's average DC component is removed, then amplified to at least half dynamic range, before performing FFT. As the result, low level signal is much easier to study. See the comparison below. This option becomes obsolete if you move to FFT II.
  
  
• Bonus for users with paid registration :

• CopyToClipboard button provides quick access to a copy of the waveform
• No ad-line in the charts
• No run time limit